[ https://issues.apache.org/jira/browse/HBASE-12411?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14216983#comment-14216983 ]
Hudson commented on HBASE-12411: -------------------------------- FAILURE: Integrated in HBase-TRUNK #5788 (See [https://builds.apache.org/job/HBase-TRUNK/5788/]) HBASE-12411 Optionally enable p-reads and private readers for compactions. (larsh: rev 822bcce91e5d80f778c009dcc6d50089276859df) * hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/compactions/DefaultCompactor.java * hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/StoreScanner.java * hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/StoreFile.java > Optionally enable p-reads and private readers for compactions > ------------------------------------------------------------- > > Key: HBASE-12411 > URL: https://issues.apache.org/jira/browse/HBASE-12411 > Project: HBase > Issue Type: Improvement > Components: Performance > Reporter: Lars Hofhansl > Assignee: Lars Hofhansl > Fix For: 2.0.0, 0.98.9, 0.99.2 > > Attachments: 12411-v2.txt, 12411-v3.txt, 12411-v4.txt, 12411.txt > > > In the light of HDFS-6735 we might want to consider refraining from seek + > read completely and only perform preads. > For example currently a compaction can lock out every other scanner over the > file which the compaction is currently reading for compaction. > At the very least we can introduce an option to avoid seek + read, so we can > allow testing this in various scenarios. > This will definitely be of great importance for projects like Phoenix which > parallelize queries intra region (and hence readers will used concurrently by > multiple scanner with high likelihood.) -- This message was sent by Atlassian JIRA (v6.3.4#6332)